AGREE with, your First sentence, Bergers "work" for, MOST Hunters !!135gr Classic Hunters in 6.5x55 loaded about 2600 fps have performed very well on deer and cow elk from 40yrds to 280yrds. When the bullet was placed behind the shoulder the animal died quickly.
That said, I would not shoulder shoot animals with Bergers on purpose because I am afraid they might not penetrate fully with the bullets I shoot.
My buddy is a novice hunter and this year we he is chasing cow elk with a 308. I am loading Barnes for him because they are more forgiving if he hits the shoulder instead of getting it right behind the shoulder.
But, you SHOULD, spend some TIME/ Ammo on, Teaching your Buddy to shoot ! Do Field positions, on 10-12" dia. Steel Plates, til' he can hit them 5 Times, in a row ! We shoot about, 60 -80 Bullets, in Practice every Year, for every, Elk / Deer that, we shoot.
"Leaning on" another, Bullet,.. in case, he MISSES, the "Boiler Room" is,.. BS !
Our Elk / Big Game, deserve,.. BETTER !